英语六级完形填空精选练习(3)

Directions: There are 20 blanks in the following passage. For each blank there are four choices marked [A], [B], [C] and[D] on the right side of the paper. You should choose the ONE that best fits into the passage. Then mark the corresponding

letter on Answer Sheet 2 with a single line through the center.

Scientists around the world are racing to learn how to rapidly diagnose, treat and stop the spread of a new, deadly disease. SARS--Severe Acute Respiratory Syndrome--was 62 for the first time in February 2003 in Hanoi, 63 since then has infected more than 1,600 people in 15 countries, killing 64 At this 64 ,there are more questions than answers surrounding the disease.

Symptoms start 65 a fever over 100. 4 degrees F, chills, headache or body 66 Within a week, the patient has a dry

cough, which might 67 to shortness of breath. In 10% to 20%of cases, patients require 68 ventilation to breathe. About 3.5%die from the disease. Symptoms 69 begin in two to seven days, but some reports suggest it 70 take as long as 10 days. Scientists are close to 71 a lab test to diagnose SARS. In the meantime, it is diagnosed by its symptoms. There is no evidence 72 antibiotics or anti-viral medicines help, 73 doctors can offer only supportive care. Patients with SARS are kept in isolation to reduce the risk of 74 . Scientists aren’t sure yet, but some researchers think it’s a 75 discovered coronavirus, the family of viruses that cause some common colds.

Most cases appear to have been passed 76 drop lets expelled when infected patients cough or sneeze. Family members of infected people and medical workers who care 77 them have been most likely to 78 the illness. But recent developments in Hong Kong suggest that the 79 might spread through air, or that the virus might 80 for two to three hours on doorknobs or other 81 Health experts say it is unlikely, though, that sharing an elevator briefly with an infected person would be enough to pass the virus.